QJmotor RACE 400R Stock Exhaust on Dynojet

[@zx4rrow]

what does the button in your hand do? Why does the exhaust sound change after pressing the button? Is the exhaust sound up to 40 seconds original?

[@hwnesports]

mic

[@haktansaglam8971]

oxygen censor is off man:)

[@AlanCheong]

so strange that you are promoting handphones on a motorcycle channel. you can at least promote some motorcycle related products instead